The strange this is if I use the public IP address of network instead of the dns name it works. The problem lies with the server rejecting the credentials when I use the https://abc.dyndns.org name to connect.

I posted thei elsewhere and have made some pregresses but not resolved the problem.

Sorry, you can test my answer above by using plain http connection at http://domainname/exchange from IE and you should get the certificate error warning page instead of the automatic flip to https you would get from a good cert.

If you can click on continue to site and you get the OWA login screen, then replace the certificate on the server and on all the client machines that connect to the server.

I ran the CEICW changing the certificate name to a random name. I then ran it again using the original self generated certificate name and it worked.

So it looks like you were on the right track with the certificate. Not sure why it went wrong and why running the CEICW originally with the correct cert name didn't correct the problem. But it is all ok now.

Thanks for your suggestions.

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